Physics
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprl11001d&link_type=abstract
American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #L11.001
Physics
Scientific paper
We investigate hard interaction in QCD through the measurement of cross sections of mid-rapidity production of non-identified charged hadrons from p+p collisions at √s = 62.4 GeV. Measurements are made in the transverse momentum range from 0.5 GeV/c to 4.5 GeV/c by the PHENIX experiment at RHIC. Predictions based on perturbative QCD calculations at next-to-leading order (NLO) are consistent with the cross section results. The data are also consistent with resummed perturbative QCD calculations, which include terms with next-to-leading log (NLL) accuracy and have correspondingly reduced theoretical uncertainties. The double helicity asymmetry measurements of mid-rapidity non-identified charged hadrons in the measured transverse momentum range are sensitive at leading order to the polarization of gluons in a momentum fraction range 0.05 <=xgluon<=0.2.
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